Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\soli\vendor\spomky-labs\pki-framework\tests\ASN1\DERDataTest.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\soli\vendor\spomky-labs\pki-framework\tests\ASN1\DERDataTest.php on line 21